Production of particleboards with bamboo (Dendrocalamus giganteus) reinforcement

PEER-REVIEWED ARTICLE bioresources.com

Zaia et al. (2015). “Particleboard reinforcement,” BioResources 10(1), 1424-1433. 1424

Production of Particleboards with Bamboo (Dendrocalamus giganteus) Reinforcement

Ulysses J. Zaia,a Juliana Cortez-Barbosa,b Elen A. M. Morales,b,* Francisco A. R. Lahr,c

Maria Fátima do Nascimento,c and Victor A. De Araujo d

The focus of this research was to study the utilization of residues from bamboo (Dendrocalamus giganteus) lamination in the manufacturing of panels for structural purposes. Bamboo particleboards were produced under three conditions: pure boards, reinforced with bamboo laminas, and with treated particles. Castor oil-based polyurethane was the resin binder, in view of using lower toxicity materials. The mechanical tests were performed according to Brazilian Standard (NBR) 14810-3 (2006) and European Standard (EN) 310 (2000). The results were superior to those recommended by these and other standards for internal adhesion resistance, modulus of rupture, and elasticity in static bending, as well as to the results of other studies. Starch treatment was an unnecessary stage. According to the conditions of this process, the studied panels showed a good potential for construction use. Moreover, the bamboo particleboards are an economically viable, environmentally friendly, and sustainable alternative for the use of waste generated during the processing of Dendrocalamus giganteus bamboo species, allied with castor oil-based polyurethane resin. The reinforced particleboard and its production process are being licensed as an Innovation Patent in Brazil, (BR 1020130133919-1-2013).

Keywords: Bamboo; Particleboards; Castor oil-based polyurethane resin; Reinforcement; Waste

Contact information: a: THN Auto Brasil, R. Viriato da Silva Vianna, 235, Boituva-SP, Brazil; b:

Universidade Estadual Paulista Julio Mesquita Filho (UNESP), Faculdade de Engenharia Industrial

Madeireira, R. Geraldo Alckmin, 519, Itapeva-SP, Brazil; c: Universidade de São Paulo, Escola de

Engenharia de São Carlos (EESC-USP), Av. Trabalhador São Carlense, 400, São Carlos-SP, Brazil; d:

Research Group LIGNO of UNESP-Itapeva, R. Geraldo Alckmin, 519, Itapeva-SP, Brazil;

*Corresponding author: [email protected]

INTRODUCTION

Wood particle chipboard, among other wood-based products, has increased in

popularity as a raw material, due to cost profitability and market growth. According to

Buyuksari (2012), particleboard is one of the most widely used interior wood composite

substrates and is commonly used for cabinetry and furniture manufacture. Nascimento

(2008) mentions that the raw material for chipboard manufacturing can be forest material

from paring and pruning, ragged industrial residues (e.g., slabs, leavings of top cutting, and

residual-roll of wood lamination), thin industrial waste (e.g., sawdust and planer shavings),

chips from furniture and carpentry industrial processing, or lignocellulosic materials such

as sugarcane-bagasse (Acharya et al. 2011), rice husk (Chen et al. 2013), and other

agricultural residues in a pure mode or mixed with wood particles.

Rasat et al. (2012) suggested that composite boards from oil palm frond agricultural

residues have the potential to be used as a wood alternative to overcome the material

shortage in the wood industry.



Campos et al. (2009) determined a method of near infrared spectroscopy to evaluate

compositions of agro-based particleboards produced from eucalyptus and pine mixed with

sugarcane-bagasse, justifying their possibile applications in research.

Yang et al. (2014) report that over the past decades, many non-wood lignocellulosic

biomasses, including bamboo, wheat straw, cotton stalks, sunflower stalk, and kenaf stalk,

have been used to produce particleboards or other end products. In searching for alternative

processes, it was discovered that bamboo is a great option for particle production.

Currently, it is estimated that about 1 billion people worldwide use bamboo as a source of

subsistence. Bamboo has few deformations and good stability in the production of panels

(Moizés 2007). Because of its qualities, there is a large industrial development for the use

of this material (Lima et al. 2008). Pereira (1997) reports that bamboo is a unique natural

resource in that it takes less time to be renewed because of the superior speed of growth

and area utilization. Additionally, Pereira (1997) highlights that bamboos’ structural

strength-to-weight ratio is comparable to steel. This high resistance can be explained by

the distribution of fiber in the outside (40 to 90%) and inside (15 to 30%) of the bamboo

stalk. Bamboo processing, especially for industrial production of glued laminated boards,

generates waste which can become a pollutant, in addition to representing high losses of

natural resources. Bamboo material has also been studied as reinforcement of sawn wood

or wood-based pieces, which have proven to be an eco-efficient alternative.

Bamboo can be an alternative to the production of particleboards as well being used

to reinforce bio-composites (Abdul Khalil et al. 2012). In many countries, bamboo is used

as a building material and industrial raw material for many industries because it has

excellent shear strength and stiffness values. Bamboo has several advantages such as fast-

growth, perennial plantation, and ease of propagation, maintenance, and harvesting.

Bamboo particleboards emerged with the objective to reuse residues of bamboo

processing such as small-diameter culms, bases, and stem tops (Kai and Xuhe 2005).

Therefore, according to these authors, the great advantage of these boards are an ample raw

material supply and the fact that the manufacturing process is similar to the technology of

wood particleboards. Calegari et al. (2007) concluded that the use of bamboo culms

(Bambusa vulgaris Schr.) provides a viable alternative in the production of chipboards,

since they behave similarly to those produced exclusively from wood. Ultimately, novel

products are being developed; an example of this is corrugated bamboo particleboards,

manufactured from bamboo waste originating from planers. In this case, Yang et al. (2014)

made panels with a simple technology using urea-formaldehyde resin at three press

temperatures and two density levels. This study increases the perspectives on the reuse of

bamboo waste.

Recently, rising wood prices and the declining availability of wood resources have

led people to seek other analogous alternatives. Similar to wood, bamboo is a material of

natural origin that is strong, lightweight, renewable, and displays a strong adaptability to

the environment. The best way to utilize bamboo on a large scale is to design and produce

a series of bamboo-based panels with different structures and functions according to the

properties of bamboo (Kai and Xuhe 2005).

Regarding the chipboards produced with bamboo waste, Sampaio et al. (2008)

made homogeneous bamboo particleboards (Dendrocalamus giganteus) with the addition

of urea-formaldehyde with the culm and bract; this last leaf stem derived from the same

bamboo clump, which is rich in fibers, as is an alternative to replace the solid wood and to

add economic value to the material. The variation on percentage occurred in the waste of



bamboo and bract. The board contents were: 25% bract and 75% bamboo; 50% of each;

75% bract and 25% bamboo; and 100% of each bract and bamboo.

Vieira et al. (2010) produced particleboards of bamboo and pine. The materials

included urea-formaldehyde as an adhesive in the proportion of 10% of the dry weight of

material, bamboo particles originating from the apical part of the culm, and pine particles

derived from industrial processing. Laemlaksakul (2010) manufactured chipboards using

bamboo culm waste from the species Dendrocalamus asper Backer, which were collected

from the production process of chips, with urea-formaldehyde adhesive, varying the

temperatures in the packaging of the specimens prior to testing at 25, 40, and 55 °C.

Homogeneous panels of bamboo (Guadua magna) with a nominal density of 0.65 g/cm3,

particle sizes of 1.0 and 1.5 mm, and urea-formaldehyde and phenol-formaldehyde resins

at 8% were produced by Arruda et al. (2011).

Regarding the use of bamboo reinforcements, Cortez-Barbosa et al. (2011)

analyzed the mechanical characteristics of wood-bamboo composite material, where the

samples were developed from combinations of bamboo lamina as structural reinforcement

in solid wood pieces of pine and in edge glued panels (EGPs). The wood species used was

Pinus taeda and the bamboo species were Dendrocalamus giganteus and Guadua

angustifolia. The values obtained in the tests showed an increase in strength and stiffness

compared to pieces without any reinforcement.

Ferro et al. (2014) realized an evaluation of the influence of castor-oil based

polyurethane resin formulation (particularly proportion of pre-polymer/polyol) in static

bending properties (modulus of elasticity and modulus of rupture) of particleboards

produced with Paricá wood (Schizolobium amazonicum). These authors considered that the

proportion of 1:1 (polyol/pre-polymer) could be the best solution, because it showed better

mechanical performance and it used the least amount of petroleum derivative.

Whilst most research related to manufacturing of wooden composites considers the

use of chemical-based resin, new applications with vegetable-based resin could be realized,

as for example, the castor oil-based polyurethane. This resin has been used in Brazilian

studies with promising results. This resin is more ecological than solely chemical-based

adhesives, such as urea-formaldehyde, because it uses castor beans as a natural material.

In the 21st century, the triad formed by the sustainability, waste utilization and

development of new materials has often been commented upon. In addition to this, the

Brazilian legislation “12.484-2011” established a national policy for the sustainable

management and bamboo cultivation (Cortez-Barbosa et al. 2014).

Due to this Brazilian legislation, some sectors will probably generate in the future

a considerable amount of bamboo waste, especially through the bamboo lamination

manufacturing process. Therefore, the objective of this research was to produce

particleboards from bamboo Dendrocalamus giganteus residues of the bamboo lamination

process, reinforced with laminas of the same bamboo species for structural purposes in

construction.

EXPERIMENTAL

Materials The Dendrocalamus giganteus bamboo species used in this work has culms with

heights from 24 to 40 m, internodes from 0.40 to 0.50 m, diameters from 0.10 to 0.20 m,

and wall thicknesses of 1 to 3 cm, varying according to culm height.



The laminas for reinforcement were extracted in the basal section of bamboo culms,

and preferentially near the external part of the culm, with the presence of knots. Bamboos

approximately five years old were collected in the Southeast region of São Paulo State,

Brazil.

The castor oil-based polyurethane was the resin used both in the production of the

particleboards and in the reinforcement of these particleboards.

Methods To produce the laminas that were used as reinforcement, it was necessary to

machine the bamboo pieces using a circular saw (trimmer saw with adapter for cylindrical

pieces) as a safety guide. Bamboo was machined longitudinally into six parts (cleats), and

the diaphragms were removed afterwards with a band saw. The cleats were machined in a

three-side planing machine to standardize the desired thickness of the laminas, which

ranged from 1.63 to 2.13 mm, in according to culm thicknesses and also because of the

variation in the cutting process. The lamina length was 350 mm, and its width was about

30 mm.

The waste collected during the processing of the laminas was separated by a

vibrating screen and divided into three groups: dust, particulates retained in sieves of 3-

mm diameter, and particulates retained in sieves of 7-mm diameter. Part of the residues

were pre-treated by submerging in warm water for 20 h and then drying at 100 °C in a drier

(with and without air circulation) to remove starch present in the bamboo culms. The starch

removal was realized to avoid future insect attacks and also to verify if this starch could

interfere in the adhesion process of resin, once it is known that its presence affects some

healing processes, for example with cement. Treated and untreated residues were dried in

the same manner, through a final drying at 60 °C.

The processed particles of D. giganteus were mixed in a gluing machine to make

the mat, using castor oil-based polyurethane resin in proportions of 15% of dry mass. Nine

boards were produced, each one with the same volume of particles, and pressed at high

temperature (100 °C), using a hydraulic press by a pressing time of 10 min and pressure of

3.5 MPa. Four boards used pre-treated residues (with reinforcement), three boards did not

undergo this treatment (with reinforcement), and two boards did not undergo treatment

(without reinforcement), to examine the influence of reinforcement and treatment. A

reinforced board sample is shown in Fig. 1.

Fig. 1. Particleboard manufactured with bamboo waste and reinforced with bamboo laminas

All the boards had nominal dimensions of 350 x 350 mm. The panels’ thicknesses

were 10 mm, 13 mm, and 14 mm for pure boards (PB), reinforced non-treated boards

(RNB), and reinforced-treated boards (RTB), respectively. These thickness were different

due to the presence of laminas of reinforcement.



Specimens were removed from the particleboards for testing of internal adhesion

resistance (bonding) and static bending, to determine modulus of rupture (MOR) and

modulus of elasticity (MOE). The tests were conducted in universal testing machines (of

30 ton and 10 ton), according to the standards NBR 14810-3 (2006) and EN 310 (2000),

respectively. The static bending specimens were obtained according to the orientation of

the laminas in the reinforced panels, which were arranged all in the same direction, one

parallel to each other. Analysis of Variance (ANOVA) and Tukey tests, conducted at 5%

significance levels, were applied to identify the difference in average values.

RESULTS AND DISCUSSION

Table 1 presents the average values for modulus of rupture in static bending.

Table 1. Average values of the MOR (MPa)

RTB1 RTB2 RTB3 RTB4 RNB1 RNB2 RNB3 PB1 PB2

ẋ 111 133 139 165 140 154 156 44 31

sd 21 21 11 20 31 31 18 12 10

CV 19 16 8 12 23 20 12 27 30

RTB: reinforced-treated boards - 4 boards, RNB: reinforced non-treated boards - 3 boards, PB: pure boards - 2 boards. ẋ: average, sd: standard deviation, CV: coefficient of variation (%)

Average values of MOR for the reinforced-treated boards, reinforced non-treated

boards, and pure boards (without treatment and without reinforcement) were 137, 150, and

38 MPa, respectively. This situation could suggest that the bamboo pre-treatment process

caused some chemical modification in the bamboo particles, generating a decrease in the

static bending resistance, and showing that a pre-treatment of particles for the composite

manufacturing is not necessary. This also suggests that the addition of the bamboo lamina

reinforcements generated an increase in static bending strength more than 200%, even

though the laminas did not influence the final density (Table 3) of the composite. Despite

of a major quantity of raw material in reinforced boards, the volume was lower than in non-

reinforced boards, because of the compaction stage. These values surpassed the

requirements of standards NBR 14810-2 (2002) of 16 MPa for wood particleboards and

EN 300 (2000) for wooden-OSB type 4 of 28 MPa in the longitudinal direction, even for

non-reinforced chipboards. Table 2 shows the average values for modulus of elasticity in

static bending.

Table 2. Average values of the MOE (MPa)

RTB1 RTB2 RTB3 RTB4 RNB1 RNB2 RNB3 PB1 PB2

ẋ 14,531 14,917 15,209 18,561 13,982 15,397 14,275 5,972 5,738

sd 3,603 1,271 1,490 1,410 1,550 1,573 2,183 1,724 1,298

CV 25 9 10 8 11 10 15 29 23

RTB: reinforced-treated boards - 4 boards, RNB: reinforced non-treated boards - 3 boards, PB: pure boards - 2 boards. ẋ: average, sd: standard deviation, CV: coefficient of variation (%)



The average values of MOE of the data shown in Table 2 for the reinforced-treated

boards, reinforced non-treated boards, and pure boards (without treatment and without

reinforcement) were 15,804, 14,551, and 5,855 MPa, respectively. These values also

surpassed the requirements of EN 300 (2002) for OSB type 4 of 4,800 MPa in the

longitudinal direction, even for particleboards produced without reinforcements. This

situation suggests that the addition of the bamboo lamina reinforcements generated an

increase in modulus of elasticity in static bending greater than 100%, even though the

laminas did not influence the final density of the composite (Table 3), as aforementioned.

As MOE values reached for both RTB (reinforced-treated) and RNB (reinforced non-

treated) boards were higher than the prescripted values by this European standard, it could

be verified that the pre-treatment of particles is not convenient.

Table 3 presents the MOR and MOE values obtained in studies by other authors

related to bamboo and wooden particleboards as compared to the current study. This table

shows the result of applying the Tukey test for this current study, where similar characters

(a or b) are statistically equivalent averages.

Table 3. Values for Mechanical Properties of the Lignocellulosic Particleboards

Authors Compositions Densities (kg/m³)

Resins MOR

(MPa) MOE

(MPa)

Zaia et al. (2014) *current study

PB RTB RNB

912 890 911

CP (15%)

38a

137b

150b

5,855a 15,805b 14,551b

Sampaio et al. (2008)

100% Bract 50% Bract / 50% Bamboo

100% Bamboo <1000 UF

11 15 21

1,335 2,105 3,901

Laemlaksakul (2010)

Bamboo 600 UF

(13%) 16 1,541

Arruda (2011) Bamboo 650 UF (8%) PF (8%)

13 14

1,819 1,722

Ferro et al. (2014)

Paricá wood (S. amazonicum)

800 CP

(12%) 20 2,001

RTB: reinforced-treated boards, RNB: reinforced non-treated boards, PB: pure boards (panels). UF: urea-formaldehyde, PF: phenol-formaldehyde, CP: castor oil-based polyurethane (resins)

ANOVA showed that the MOR and MOE values of reinforced-treated board were

statistically equivalent to the reinforced non-treated boards, suggesting that the prior

treatment of particles to reduce the starch did not influence the bonding process of the

boards with the castor oil-based polyurethane resin, as cited by Beraldo (2008), however,

it showed that there is a statistical difference between the non-reinforced and reinforced

bamboo particleboards.

From the data in Tables 1 and 2, it can be seen that the values for strength and

modulus of elasticity in static bending for particleboards were higher in this study than

those found by other authors, listed in Table 3, regardless of the treatment applied, presence

of reinforcements, or panel composition (bamboo or wood and resin type). The

reinforcement with bamboo laminas noticeably increased the values for these properties.

This is probably because the bamboo was manufactured from the outside of culms, which

contained a higher amount of fibers.



The boards in this study reached a density similar to Sampaio et al. (2008) and

Ferro et al. (2014), i.e., greater than 800 kg/m3. However, these boards reached values of

MOR and MOE superior to other studies, probably due to the reinforcement and use of

castor oil-based polyurethane resin.

These values were also superior to average values obtained, for basal part of cleats

of Dendrocalamus giganteus bamboo (with knots), by Pereira and Beraldo (2010), for

MOR and MOE equal to 118.7 MPa and 12,600 MPa, respectively. It emphasizes the

potential of this composite for structural applications. Figure 2 shows the types of rupture

in some static bending specimens of the bamboo particleboard.

Fig. 2. Types of ruptures after the static bending test

From the specimens tested in static bending, after breaking, the specimens for

internal adhesion testing were selected. For RNB there was a smaller number of specimens.

Different types of ruptures in the specimens of static bending test caused shorter reusable

sections. Thus, it was possible to prepare for internal adhesion testing five specimens for

reinforced-treated boards, three for reinforced non-treated boards, and ten specimens for

pure boards, providing the average values of 2.21, 2.25, and 3.01 MPa, respectively.

Internal adhesion (or internal bonding) values collected in this study are listed in

Table 4, along with data obtained from other studies. It is observed these values exceed

those found by other authors, regardless of the treatment, especially for non-reinforced

particleboards. This table shows the result of applying the Tukey test for this current study,

where similar characters are statistically equivalent averages.

Table 4. Values for Internal Adhesion for Particleboards

Authors Compositions Densities (kg/m³)

Internal Adhesion (MPa)

Zaia et al. (2014) *current study

PB (CP) RTB (CP) RNB (CP)

912 890 911

3.01a

2.21a

2.25a

Laemlaksakul (2010) Bamboo (UF) 600 0.19

Arruda (2011) Bamboo (PF) Bamboo (UF)

650 650

0.26 0.32

Sampaio et al. (2008) 100% Bract

50% Bract / 50% Bamboo 100% Bamboo

<1000 0.13 0.24 0.22

RTB: reinforced-treated boards, RNB: reinforced non-treated boards, PB: pure boards (panels). UF: urea-formaldehyde, PF: phenol-formaldehyde, CP: castor oil-based polyurethane. (resins)

The results show the values found were higher than those prescribed by the

standards: 0.40 MPa of NBR 14810-3 (2006) for wood particleboards and 0.45 MPa of EN

300 (2000) for wood OSB panels of type 4, regardless of the treatment and presence or

absence of bamboo reinforced laminas. The prior treatment of the bamboo particles to

remove starch did not lead to different results for bamboo boards without treatments.



ANOVA shows that the resistance in internal adhesion values of reinforced and

treated board were statistically equivalent to the reinforced non-treated boards, even as this

last equivalence occurred with non-treated and non-reinforced particleboards.

The higher apparent values of internal adhesion for the particleboards without

reinforcement, or pure boards, can be explained by the rupture of the reinforced boards in

some specimens precisely at the glue line between the reinforcement bamboo laminas and

the bamboo particleboards. In the non-reinforced boards, the ruptures occurred in the center

of the specimens, as seen in Fig. 3.

Fig. 3. Boards without reinforcement after internal adhesion test

CONCLUSIONS

1. Treatment for the removal of starch did not result in differences in mechanical

properties, which can be explained by the castor oil-based polyurethane resin

displaying no change while in the presence of starch.

2. The particleboards presented consistent and satisfactory results. Even for lower values

between boards with and without reinforcement, these values conformed to the

standard requirements or they presented similar or superior values to particleboards

reported in the literature. This situation also was particularly seen for OSB type 4,

which is used in structural applications.

3. Therefore, this study shows an economically viable, sustainable, and environmentally

friendly alternative for the use of the waste generated in the processing of

Dendrocalamus giganteus, combined with a castor oil-based polyurethane resin (CP),

forming a panel that can be applied in structures.

ACKNOWLEDGMENTS

This research was realized in the Laboratory of Wood and Timber Structures at

School of Engineering of São Carlos of University of São Paulo (USP), and in the

Laboratory of Materials Properties at Campus of Itapeva-SP of São Paulo State University

(UNESP). The Research Group LIGNO of UNESP-Itapeva and some of its researchers and

professors also helped and shared information, contributing to this initiative. In short, we

are thankful for the support of all the involved laboratories and staffs.

The authors are grateful for the financial support of São Paulo State University

(UNESP), and in particular, their respective executive departments: FUNDUNESP and

PROPe.



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Article submitted: July 7, 2014; Peer review completed: October 15, 2014; Revised

version accepted: December 19, 2014; Published: January 15, 2015.

Production of particleboards with bamboo (Dendrocalamus giganteus) reinforcement

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